A Comprehensive Guide to Three Trimesters of Pregnancy

By Dr. Nutan Pakhare

There is nothing more beautiful than a woman’s pregnancy that lasts about forty weeks. As Mariah Carey once wrote: “Pregnancy was probably the happiest and hardest thing I’d ever gone through. I know that for many women, it can be wonderful and relatively easy.” This is akin to completing a marathon – it can be a long, hard journey but the end result is incredibly rewarding. Growing a human is an amazing and miraculous process that takes time and energy. It can be filled with both joy and challenge, but the reward is a beautiful and unique bond between mother and child that can never be broken.

The first trimester involves the first twelve weeks of pregnancy, a second trimester contains thirteen to twenty-six weeks, and a third trimester contains twenty-seven to forty weeks of pregnancy. Each trimester is characterized by different changes in the mother’s body and the baby’s growth and development. For instance, during the first trimester, the baby’s organs and body systems begin to develop and the mother may experience morning sickness and fatigue.

trimester wise guide to pregnancy

In this pregnancy guide, we will discuss each trimester and what to expect during each phase. Following this guide is like taking a road trip – the first few miles are familiar and the scenery changes slowly, but once you get to the middle of the journey, the scenery changes rapidly, and the destination is close enough to get excited about.

First trimester (Week 1-12)


The first trimester is the beginning of the pregnancy journey. During this time, the body undergoes many changes to prepare for the baby’s growth and development. The first trimester is the most crucial time in pregnancy, as it is the period when the baby’s organs and systems develop.

During the first trimester, common symptoms include morning sickness, fatigue, and breast tenderness. The mother’s body also undergoes changes such as increased blood volume, changes in hormone levels, and the beginning of the uterus’ expansion. The total blood volume increase during the first trimester of pregnancy varies from 20% to 100% above prepregnancy levels, with an average increase of 45%..

To stay healthy during the first trimester, it is essential to eat a healthy and balanced diet, exercise regularly, and get plenty of rest. It is also imperative to take prenatal vitamins, avoid smoking and alcohol, and avoid risky foods that can cause food-borne illnesses.

Second trimester (Week 13-28)


The second trimester is often called the “golden period” of pregnancy. During this time, many mothers experience relief from the symptoms of the first trimester and feel the baby’s movements.

During the second trimester, the baby’s organs and systems continue to develop and mature. The mother’s body continues to expand, and she may experience new symptoms such as back pain and constipation. Low back pain is a common symptom during pregnancy, affecting 42.5% of pregnant women in one study.

During this semester it is advisable to attend prenatal appointments, monitor blood pressure and glucose levels, and prepare for childbirth.

Third Trimester (Week 29-40)


The third trimester is the final pregnancy stage. During this time, the baby grows and develops rapidly, and the mother’s body prepares for childbirth.

During the third trimester, the mother may experience symptoms such as Braxton Hicks contractions, swelling in the hands and feet, and difficulty sleeping. Baby movements may also become more frequent and intense. It is estimated that over 75% of mothers experience difficulty sleeping during the third trimester.



Pregnancy is a beautiful and transformative journey. Each trimester brings different changes and challenges, but with proper care and preparation, it can be a joyous experience. It is essential to stay healthy and take care of yourself and your baby during each trimester. By eating an appropriate and balanced diet, exercising regularly, attending prenatal appointments, and preparing for childbirth, you can ensure a happy pregnancy and a healthy baby.

Elizabeth George, author of A Mom After God’s Own Heart: 10 Ways to Love Your Children, wrote: “A mother’s greatest joy in having a child is to give that child fully and freely to God.”

In case you are pregnant or planning to become pregnant, call in your healthcare provider. It is important to seek medical advice during each trimester to ensure your health. In order to ensure a healthy and safe pregnancy, we can provide you with personalized advice and support.